The simplified local density approach (SLD) is extended to the Elliott-Suresh-Donohue (ESD) equation of state for the modeling of gas adsorption on activated carbon, providing significant improvement in quantitative modeling compared to the SLD approach using the Peng-Robinson equation of state or the van der Waals equation. Compared to the Peng-Robinson and van der Waals equations, the ESD equation more accurately represents the temperature dependence of adsorption.

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Deposition behavior of thin films of contaminants (less than 10 A) has been studied under vacuum conditions. Dependence of deposition behavior on the composition of the contaminant and of the condensing surface was considered. Quartz crystal microbalances (QCMs) were used to measure the mass accumulation rates of contaminants. Experimental results indicate that rough surfaces have higher mass accumulation than smooth surfaces and that polar attraction between the contaminant and the condensing surface affect deposition behavior.